This is an important question. Meditation does not deal with thoughts. The idea is to go beyond thoughts. The mind does not like it. It puts up a fight. The fight of mind can be of the following types:

Do not do it: The mind tries to first give reasons of how there is no point doing meditation. The mind ought to be convinced about doing the meditation. Somehow, you have convinced the mind. The reasons are sound. You are now ready to do the meditation.

Procrastination: Mind now tells you that it is ok to meditate. You can start it tomorrow. Be careful about this. Tomorrow never comes.

Hijacking: Now you are there. You have convinced your mind that meditation is good for you and you are ready to do it. You sit down or lie down and start the meditation. The mind brings some beautiful related thoughts. You start thinking of how great it is. You will meditate regularly every day. Good thoughts flood your mind. Be careful about this hijacking. There is no point fighting the mind. Just be a witness. It is similar to driving on a highway. There will be traffic. Thoughts will come and go. Let it just transit. Become a witness. If you get hijacked, do not get disappointed. Just come back to ground zero and flow with the meditation.

Projections: This brings imagery. Tara is said to have come to Buddha durng his final stages. If you have conserved enough energy and have passed the prior three points….this stage can appear. The image could be really close to reaity. I will leave this here.

So in short….let thoughts just transit. It is common to get hijacked. Just come back and start again. There is no point focusing on one thought.